Safety device for boiler feed and delivery pipings



June 24,1930. 7 7 E. RUSCHKE 1,755,883

SAFETY DEVICE FOR BOILER FEED AND DELIVERY PIPINGS- Filed Dec. 8. 1927 L-HP efwee nwALD'nUscrmE, OF LUDER, Hr in'ovnn,GER NY I i SAFETY 'nEvIcn FOR BOILER rnnnn m DELIVERY-IIPINGS Application filed December 8,- 1927, Serial No. 238,663, and in Germany July 14, 11926.1.

Fractures of pipes and valves which hap- In the generally used combined feed valves 11 pen frequently in boiler feed pipings are due the. loose con ea of the check valve isconneetin most cases to the fact that the boiler feededto the feed pipe I), and the stationaryvalveg valves or intermediate valves are not opened head of the shut-ofivalve is connected diin proper time, or that the stationary valverectly to the boiler d, the water flowing' outI 55 head oi'the feed-valvecombined with acheck underneath this stationary valve-head- When 7 Valve has been detached from its spindle by" the stationary valve-head c is detached from rusting", water-hammer or the like, so that the its spindle e for any reason whatsoever, the i feed pump has to work against closed valves 'water supply to the boiler is interrupted so 10 and produces a water pressure which is too that in thefeed pipe atoo' high pump pressure 60 high for the feed pipe. The. spring-loaded will be produced. In this casea fracture off" safety valves mounted in certain teed-pipthe feed valve between the stationary valve rings do not always give sufficient protection, head and the loose cone .wouldbe most dan I as they are sometimes tightened more stronggerous, as the hotboiler' water could theniflo'w' ly-by the staff in opposition to the rules so. out without any' possibility of shutting itjofi, 65 that they must 'evidently' fail in emergency as the hot boiling water prevents access to the Cases, I I feedvalve. I

This i-nvcntionrelates to a safety device for. i TO avoid these dangers the'Sa GtY d vice boiler feedand delivery-pipes and the like, according tothe application may be arranged" which absolutely prevents pipe-fractiu'esdue directly oath feed valve between the sh'ut' 0 to excessive pressure, even when 'no special oii Valve and' theoheck valve. r safety valve exists. To attain this object a Vlith this object in view/av tubular "exten short branch tubeisarranged at a suitabl sion f is either cast in one piece with the feed I point; of tlicfeed pipe in Which branch tube valve o u s q e y u d on the am a thin metal diaphragm is interchangeably Saidtubular extensionhaving a ring-shaped 75 mounted so that it isiexposed on'the oneside bear- 11g sillface On his bearing surface to the pressure in thefi'eed pipe and on. the O p ki gl'ing hplaoe h' hi eari g otherqside to the atmospheric pressure. When surface a thin circular metal-diski is placed the pressure in the feed pipe, owing to errors and secured in its positionby a screw stopper i Jof the stair" or todistu'rbances in thepipings, 7c. The thickness of the metal disk 2'; depends 80 exceeds the admissiblelimit only. the metal 1 he a tualw r ingipr ssure Oft e plant plate is destroyed, the piping remaining inand is selected so 'that the metal disk "will tact. Thewater flowing out through the torn tear whenthe admissible pressure 'for the metal plate can be delivered at any convenplplng is exceeded. The thin disk 71 must eviientf'point until the feed pump has been dently be made of non-corrodible metal. The 5' Fig. 1.

stopped, whereupon a freshmetal-plateis in-' tu ular extension f'may be arranged on the a Y serted into the branchtube. I feed valve-so that thezoutflowing wateris Two embodiments ofithe invention ar il- 7 conducted to aplace where it cannot cause any lustrated, by way of example,jin the accominco ve i e, sothat a t- @0011 Z 40 panying drawing, in which I tween the feed valve and the boiler (Z can be 9 Fig. 1 shows the safety device arranged beeasily closed. Instead of a simple screw stoptween the stationary valve-head of the boiler per is as shown in Fig. 4, a-screw stopper is x feed valve and the checkv'alve-head. 7 preferably used which-has a pipe connection Fig. 2 is a horizontal central-section of m. Through this pipe connection the out-.

U p 7 i flowing water can be returned by means of a 9 I Fig. 3 shows the'safety device as a separate connecting pipe for instance to the feed water fitting to bemounted at any convenient point tank or to the suction p pe, or to'the outer of the feed pipe. Y sideof the bulldlngt' p Fi 4 shows th t for the sai'e- In order that also in this case it may be 59 ty device. 1 possible to ascertain whether the metal plate has torn, i. e., whether there is a leak in the piping',a small control cock n isscrewed into .the screw stopper k and held openpermar nently during the service; At fracture of a 1' the plate 2' a thin water jet flows out of the V Cook n which can then be closed at once.

'Theabove described safety" device might be .constructedas shownin Fig 3 as'a separate fitting. In this case the tubular extension f is arrangedon'a short pipe 0 which by means of screw pipejoints p or by means of flanges may be'inscrtedat any convenient point in the feed pipe g, The other elements of the safety device are the same as above to described. 4

The screw stopper. is, m may be altered without departing from the scope of the invention, The safety device maybe evi- 1 dently arranged on ordinary intermediate valves and branch tubes of the feed pipe, the connection being either screw connections or 1 flange connections.

,Iclaim:+ I r 1 A safety device for boiler feed valves a characterized by the combination ofan inter-' changeable diaphragm plate 'with'a boiler feed valve and built'directly into the valve case between the valve head and the shut oli' 7 Valve and adapted to protect the valve case I against excessive pressure and atthe same time protect thefee'd water pipe on fracture of the hand operated valve 7 a a 2. A safety device for boiler feedand delivery pipes comprisingin combination, the boiler pipe a short pipe branching from said boiler pipe, a changeable thin metal dia phragm mounted in said branch pipe, a screw* stopper for securing said'thin metal plate in 1 its position so thatit is exposed on theone side to the pressure in ,the'feed pipe'a-nd on the 'other side to the atmospheric pressure; a

pipe connection fon therouter end ofxsaid V V screw stoppeljand a smallcontrol cock in said screw stopper for indicating the fracture of the metal plate. Q 7 I In testimony whereofl afiix mysig'na tin'e i RUSCHKE. 

